Aeterno turns energy promises into proven outcomes. Home by home, street by street.
HeatAssure™, from Aeterno, keeps one governed record of every home you answer for, connected or not, and checks what was delivered against what was promised as evidence arrives.
We are the company behind HeatAssure™, built and run from Bath, England.
We build everything we run ourselves, for whoever has to stand behind the numbers. The product is HeatAssure™: one record per home, held to what the home was promised, free to the people who live there and paid for by the people who answer for them.
Aeterno is independently owned: no manufacturer holds equity, a board seat or influence over the method, and the record we keep is owned by no party it judges. The constraints behind that are set out in full on Trust.
Aeterno Ltd is registered in England and Wales, company number 12917530, based in Bath.
In writing, in the contract, in person.
Work is scoped in writing before it starts and judged against acceptance criteria agreed up front. Delivery and operations are documented, continuity is part of the contract, and escalation is named in it. Each customer’s data is kept in its own environment, with the boundaries written into the contract. And in the first call you meet the people who build and run the service.
Where we stand today.
- Manufacturer-agnostic by design: evidence from any maker’s systems, with certified products from 178 manufacturers in the record today.
- Every calculation we stand behind is cross-validated against the government's own reference for its method, from approved SAP software to the official Home Energy Model implementation.
- A live governed platform: every screen resolves against a governed viewpoint, and every claim carries its validation status, including the red ones.
- Three patent families filed.
- The same validated calculations power a reconstruction of UK housing stock covering around 18 million dwellings.
SAP, mentioned above, is the UK's standard method for rating home energy.